gdb/parser-defs.h - gdb

Global variables defined

Data types defined

Macros defined

Source code

  1. /* Parser definitions for GDB.

  3.    Copyright (C) 1986-2015 Free Software Foundation, Inc.

  5.    Modified from expread.y by the Department of Computer Science at the
  6.    State University of New York at Buffalo.

  8.    This file is part of GDB.

  10.    This program is free software; you can redistribute it and/or modify
  11.    it under the terms of the GNU General Public License as published by
  12.    the Free Software Foundation; either version 3 of the License, or
  13.    (at your option) any later version.

  15.    This program is distributed in the hope that it will be useful,
  16.    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18.    GNU General Public License for more details.

  20.    You should have received a copy of the GNU General Public License
  21.    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

  23. #if !defined (PARSER_DEFS_H)
  24. ‌#define PARSER_DEFS_H 1

  26. #include "doublest.h"
  27. #include "vec.h"
  28. #include "expression.h"

  30. struct block;
  31. struct language_defn;
  32. struct internalvar;

  34. extern int parser_debug;

  36. ‌#define parse_gdbarch(ps) ((ps)->expout->gdbarch)
  37. ‌#define parse_language(ps) ((ps)->expout->language_defn)

  39. ‌struct parser_state
  40. {
  41.   /* The expression related to this parser state.  */

  43.   struct expression *expout;

  45.   /* The size of the expression above.  */

  47.   size_t expout_size;

  49.   /* The number of elements already in the expression.  This is used
  50.      to know where to put new elements.  */

  52.   size_t expout_ptr;
  53. };

  55. /* If this is nonzero, this block is used as the lexical context
  56.    for symbol names.  */

  58. extern const struct block *expression_context_block;

  60. /* If expression_context_block is non-zero, then this is the PC within
  61.    the block that we want to evaluate expressions at.  When debugging
  62.    C or C++ code, we use this to find the exact line we're at, and
  63.    then look up the macro definitions active at that point.  */
  64. extern CORE_ADDR expression_context_pc;

  66. /* The innermost context required by the stack and register variables
  67.    we've encountered so far.  */
  68. extern const struct block *innermost_block;

  70. /* Number of arguments seen so far in innermost function call.  */
  71. extern int arglist_len;

  73. /* A string token, either a char-string or bit-string.  Char-strings are
  74.    used, for example, for the names of symbols.  */

  76. ‌struct stoken
  77.   {
  78.     /* Pointer to first byte of char-string or first bit of bit-string.  */
  79.     const char *ptr;
  80.     /* Length of string in bytes for char-string or bits for bit-string.  */
  81.     int length;
  82.   };

  84. ‌struct typed_stoken
  85.   {
  86.     /* A language-specific type field.  */
  87.     int type;
  88.     /* Pointer to first byte of char-string or first bit of bit-string.  */
  89.     char *ptr;
  90.     /* Length of string in bytes for char-string or bits for bit-string.  */
  91.     int length;
  92.   };

  94. ‌struct stoken_vector
  95.   {
  96.     int len;
  97.     struct typed_stoken *tokens;
  98.   };

  100. ‌struct ttype
  101.   {
  102.     struct stoken stoken;
  103.     struct type *type;
  104.   };

  106. ‌struct symtoken
  107.   {
  108.     struct stoken stoken;
  109.     struct symbol *sym;
  110.     int is_a_field_of_this;
  111.   };

  113. ‌struct objc_class_str
  114.   {
  115.     struct stoken stoken;
  116.     struct type *type;
  117.     int class;
  118.   };

  120. ‌typedef struct type *type_ptr;
  121. ‌DEF_VEC_P (type_ptr);

  123. /* For parsing of complicated types.
  124.    An array should be preceded in the list by the size of the array.  */
  125. ‌enum type_pieces
  126.   {
  127.     tp_end = -1,
  128.     tp_pointer,
  129.     tp_reference,
  130.     tp_array,
  131.     tp_function,
  132.     tp_function_with_arguments,
  133.     tp_const,
  134.     tp_volatile,
  135.     tp_space_identifier,
  136.     tp_type_stack
  137.   };
  138. /* The stack can contain either an enum type_pieces or an int.  */
  139. ‌union type_stack_elt
  140.   {
  141.     enum type_pieces piece;
  142.     int int_val;
  143.     struct type_stack *stack_val;
  144.     VEC (type_ptr) *typelist_val;
  145.   };

  147. /* The type stack is an instance of this structure.  */

  149. ‌struct type_stack
  150. {
  151.   /* Elements on the stack.  */
  152.   union type_stack_elt *elements;
  153.   /* Current stack depth.  */
  154.   int depth;
  155.   /* Allocated size of stack.  */
  156.   int size;
  157. };

  159. /* Helper function to initialize the expout, expout_size, expout_ptr
  160.    trio inside PS before it is used to store expression elements created
  161.    during the parsing of an expression.  INITIAL_SIZE is the initial size of
  162.    the expout array.  LANG is the language used to parse the expression.
  163.    And GDBARCH is the gdbarch to use during parsing.  */

  165. extern void initialize_expout (struct parser_state *ps,
  166.                                size_t initial_size,
  167.                                const struct language_defn *lang,
  168.                                struct gdbarch *gdbarch);

  170. /* Helper function that reallocates the EXPOUT inside PS in order to
  171.    eliminate any unused space.  It is generally used when the expression
  172.    has just been parsed and created.  */

  174. extern void reallocate_expout (struct parser_state *ps);

  176. /* Reverse an expression from suffix form (in which it is constructed)
  177.    to prefix form (in which we can conveniently print or execute it).
  178.    Ordinarily this always returns -1.  However, if EXPOUT_LAST_STRUCT
  179.    is not -1 (i.e., we are trying to complete a field name), it will
  180.    return the index of the subexpression which is the left-hand-side
  181.    of the struct operation at EXPOUT_LAST_STRUCT.  */

  183. extern int prefixify_expression (struct expression *expr);

  185. extern void write_exp_elt_opcode (struct parser_state *, enum exp_opcode);

  187. extern void write_exp_elt_sym (struct parser_state *, struct symbol *);

  189. extern void write_exp_elt_longcst (struct parser_state *, LONGEST);

  191. extern void write_exp_elt_dblcst (struct parser_state *, DOUBLEST);

  193. extern void write_exp_elt_decfloatcst (struct parser_state *, gdb_byte *);

  195. extern void write_exp_elt_type (struct parser_state *, struct type *);

  197. extern void write_exp_elt_intern (struct parser_state *, struct internalvar *);

  199. extern void write_exp_string (struct parser_state *, struct stoken);

  201. void write_exp_string_vector (struct parser_state *, int type,
  202.                               struct stoken_vector *vec);

  204. extern void write_exp_bitstring (struct parser_state *, struct stoken);

  206. extern void write_exp_elt_block (struct parser_state *, const struct block *);

  208. extern void write_exp_elt_objfile (struct parser_state *,
  209.                                    struct objfile *objfile);

  211. extern void write_exp_msymbol (struct parser_state *,
  212.                                struct bound_minimal_symbol);

  214. extern void write_dollar_variable (struct parser_state *, struct stoken str);

  216. extern void mark_struct_expression (struct parser_state *);

  218. extern const char *find_template_name_end (const char *);

  220. extern void start_arglist (void);

  222. extern int end_arglist (void);

  224. extern char *copy_name (struct stoken);

  226. extern void insert_type (enum type_pieces);

  228. extern void push_type (enum type_pieces);

  230. extern void push_type_int (int);

  232. extern void insert_type_address_space (struct parser_state *, char *);

  234. extern enum type_pieces pop_type (void);

  236. extern int pop_type_int (void);

  238. extern struct type_stack *get_type_stack (void);

  240. extern struct type_stack *append_type_stack (struct type_stack *to,
  241.                                              struct type_stack *from);

  243. extern void push_type_stack (struct type_stack *stack);

  245. extern void type_stack_cleanup (void *arg);

  247. extern void push_typelist (VEC (type_ptr) *typelist);

  249. extern int length_of_subexp (struct expression *, int);

  251. extern int dump_subexp (struct expression *, struct ui_file *, int);

  253. extern int dump_subexp_body_standard (struct expression *,
  254.                                       struct ui_file *, int);

  256. extern void operator_length (const struct expression *, int, int *, int *);

  258. extern void operator_length_standard (const struct expression *, int, int *,
  259.                                       int *);

  261. extern int operator_check_standard (struct expression *exp, int pos,
  262.                                     int (*objfile_func)
  263.                                       (struct objfile *objfile, void *data),
  264.                                     void *data);

  266. extern char *op_name_standard (enum exp_opcode);

  268. extern struct type *follow_types (struct type *);

  270. extern void null_post_parser (struct expression **, int);

  272. extern int parse_float (const char *p, int len, DOUBLEST *d,
  273.                         const char **suffix);

  275. extern int parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
  276.                           DOUBLEST *d, struct type **t);

  278. /* During parsing of a C expression, the pointer to the next character
  279.    is in this variable.  */

  281. extern const char *lexptr;

  283. /* After a token has been recognized, this variable points to it.
  284.    Currently used only for error reporting.  */
  285. extern const char *prev_lexptr;

  287. /* Current depth in parentheses within the expression.  */

  289. extern int paren_depth;

  291. /* Nonzero means stop parsing on first comma (if not within parentheses).  */

  293. extern int comma_terminates;

  295. /* These codes indicate operator precedences for expression printing,
  296.    least tightly binding first.  */
  297. /* Adding 1 to a precedence value is done for binary operators,
  298.    on the operand which is more tightly bound, so that operators
  299.    of equal precedence within that operand will get parentheses.  */
  300. /* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
  301.    they are used as the "surrounding precedence" to force
  302.    various kinds of things to be parenthesized.  */
  303. ‌enum precedence
  304.   {
  305.     PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_LOGICAL_OR,
  306.     PREC_LOGICAL_AND, PREC_BITWISE_IOR, PREC_BITWISE_AND, PREC_BITWISE_XOR,
  307.     PREC_EQUAL, PREC_ORDER, PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
  308.     PREC_HYPER, PREC_PREFIX, PREC_SUFFIX, PREC_BUILTIN_FUNCTION
  309.   };

  311. /* Table mapping opcodes into strings for printing operators
  312.    and precedences of the operators.  */

  314. ‌struct op_print
  315.   {
  316.     char *string;
  317.     enum exp_opcode opcode;
  318.     /* Precedence of operator.  These values are used only by comparisons.  */
  319.     enum precedence precedence;

  321.     /* For a binary operator:  1 iff right associate.
  322.        For a unary operator:  1 iff postfix.  */
  323.     int right_assoc;
  324.   };

  326. /* Information needed to print, prefixify, and evaluate expressions for
  327.    a given language.  */

  329. ‌struct exp_descriptor
  330.   {
  331.     /* Print subexpression.  */
  332.     void (*print_subexp) (struct expression *, int *, struct ui_file *,
  333.                           enum precedence);

  335.     /* Returns number of exp_elements needed to represent an operator and
  336.        the number of subexpressions it takes.  */
  337.     void (*operator_length) (const struct expression*, int, int*, int *);

  339.     /* Call OBJFILE_FUNC for any objfile found being referenced by the
  340.        single operator of EXP at position POS.  Operator parameters are
  341.        located at positive (POS + number) offsets in EXP.  OBJFILE_FUNC
  342.        should never be called with NULL OBJFILE.  OBJFILE_FUNC should
  343.        get passed an arbitrary caller supplied DATA pointer.  If it
  344.        returns non-zero value then (any other) non-zero value should be
  345.        immediately returned to the caller.  Otherwise zero should be
  346.        returned.  */
  347.     int (*operator_check) (struct expression *exp, int pos,
  348.                            int (*objfile_func) (struct objfile *objfile,
  349.                                                 void *data),
  350.                            void *data);

  352.     /* Name of this operator for dumping purposes.
  353.        The returned value should never be NULL, even if EXP_OPCODE is
  354.        an unknown opcode (a string containing an image of the numeric
  355.        value of the opcode can be returned, for instance).  */
  356.     char *(*op_name) (enum exp_opcode);

  358.     /* Dump the rest of this (prefix) expression after the operator
  359.        itself has been printed.  See dump_subexp_body_standard in
  360.        (expprint.c).  */
  361.     int (*dump_subexp_body) (struct expression *, struct ui_file *, int);

  363.     /* Evaluate an expression.  */
  364.     struct value *(*evaluate_exp) (struct type *, struct expression *,
  365.                                    int *, enum noside);
  366.   };


  369. /* Default descriptor containing standard definitions of all
  370.    elements.  */
  371. extern const struct exp_descriptor exp_descriptor_standard;

  373. /* Functions used by language-specific extended operators to (recursively)
  374.    print/dump subexpressions.  */

  376. extern void print_subexp (struct expression *, int *, struct ui_file *,
  377.                           enum precedence);

  379. extern void print_subexp_standard (struct expression *, int *,
  380.                                    struct ui_file *, enum precedence);

  382. /* Function used to avoid direct calls to fprintf
  383.    in the code generated by the bison parser.  */

  385. extern void parser_fprintf (FILE *, const char *, ...) ATTRIBUTE_PRINTF (2, 3);

  387. extern int exp_uses_objfile (struct expression *exp, struct objfile *objfile);

  389. extern void mark_completion_tag (enum type_code, const char *ptr,
  390.                                  int length);

  392. /* Reallocate the `expout' pointer inside PS so that it can accommodate
  393.    at least LENELT expression elements.  This function does nothing if
  394.    there is enough room for the elements.  */

  396. extern void increase_expout_size (struct parser_state *ps, size_t lenelt);

  398. #endif /* PARSER_DEFS_H */